GStudyPerType: This function is mainly used within calculateVarCov.R, but can be executed on its own to determine the reliability coefficient and SEM for a dataset with a single type of assessment.
GStudyPerType(dataPerAssessmentType)A matrix presenting the observerd varianced and residual, number of ID's and the percentage of the total variance for each group
A dataframe containing columns ID, Type, Score (numeric), with only one value in column Type